Re: Spark Plug Coloring - Saab 9000 Bulletin Board - Saabnet.com
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Re: Spark Plug Coloring
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Posted by Bill Davies [Email] (more from Bill Davies) on Tue, 3 Feb 2009 13:56:19 Share Post by Email
In Reply to: Spark Plug Coloring, John, Tue, 3 Feb 2009 11:34:09
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1.1mm isn't necessarily too high but it can get that way very fast as it's the top end of the range. You will get many opinions here but for a standard, notn-tuned turbo car I'd personally go with .9mm. You might like to experiment with what suits your particular car. A bit of white might be within the "normal" range as cars run leaner than they used to, but I know where you're coming from.

You could look at the NGK site which, last time I looked anyway, had pictures of different plug conditions. You might also like to replace the odd-looking plug with a new one to see if that affects the results.

Have no experience of this, but could an under-performing injector cause this effect?

As to whether the gap caused the problem, how did they look after you re-gapped then?

Apologies if you are the world's greatest expert and know all this - there must be a dozen different "Johns" who post here! If you feel like coming out of the shadows, you'll be very welcome

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